Tenoretic tablets contain a combination of 100 mg atenolol and 25 mg chlorthalidone per tablet. This medication comes in a calendar pack of 28 tablets and also contains sodium lauryl sulphate as an additional ingredient. This is a prescription medication manufactured by AstraZeneca. The calendar pack format helps patients track their daily doses. The product contains two active ingredients - atenolol (100 mg) and chlorthalidone (25 mg) - along with sodium lauryl sulphate as an excipient.